JP2012241532A - Ignition apparatus - Google Patents

Ignition apparatus Download PDF

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JP2012241532A
JP2012241532A JP2011109337A JP2011109337A JP2012241532A JP 2012241532 A JP2012241532 A JP 2012241532A JP 2011109337 A JP2011109337 A JP 2011109337A JP 2011109337 A JP2011109337 A JP 2011109337A JP 2012241532 A JP2012241532 A JP 2012241532A
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ignition
switch
capacitor
coil
energy supply
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JP5295305B2 (en
Inventor
Kimihiko Tanaya
公彦 棚谷
Futoshi Aida
太 会田
Koji Okuda
浩司 奥田
Takayoshi Nagai
孝佳 永井
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/06—Other installations having capacitive energy storage
    • F02P3/08—Layout of circuits
    • F02P3/0876—Layout of circuits the storage capacitor being charged by means of an energy converter (DC-DC converter) or of an intermediate storage inductance
    • F02P3/0884—Closing the discharge circuit of the storage capacitor with semiconductor devices
    • F02P3/0892—Closing the discharge circuit of the storage capacitor with semiconductor devices using digital techniques
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • F02P15/10—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits having continuous electric sparks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/50—Sparking plugs having means for ionisation of gap
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T15/00—Circuits specially adapted for spark gaps, e.g. ignition circuits

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

PROBLEM TO BE SOLVED: To achieve a compact capacitive discharge ignition apparatus achieving a high secondary current and spark discharge over a long period.SOLUTION: An energy supply device 104 includes: a DC power supply 110; a resonance coil 111 connected to the DC power supply 110; a sparking capacitor 112 connected to the resonance coil 111; and a second switch 113 disposed between the sparking capacitor 112 and an earth 109. The energy supply device 104 charges the sparking capacitor 112 to have a voltage value larger than an output voltage value of the DC power supply in absolute value by making the resonance coil 111 and the sparking capacitor 112 generate an LC resonance when the second switch 113 is turned ON and a first switch 105 disposed between an ignition coil 102 and the energy supply device 104 is turned OFF by a first instruction from a control circuit 103. The energy supply device 104 supplies energy of the sparking capacitor 112 to the ignition coil 102 when the second switch 113 is turned OFF and the first switch 105 is turned ON by a second instruction from the control circuit 103.

Description

この発明は、主に内燃機関に用いられる容量放電式の点火装置に関するものである。   The present invention relates to a capacity discharge type ignition device mainly used for an internal combustion engine.

近年、環境保全、燃料枯渇の問題が提起されており、自動車業界においてもこれらへの対応が急務となっている。この対応の一例として、成層混合気を利用したエンジンの超希薄燃焼、いわゆる成層リーン燃焼がある。成層リーン燃焼は、燃焼室内の一部領域、点火プラグ近傍の領域のみに可燃の空気/燃料の混合気を形成しこれを燃焼させる手法であって、吸気損失を低減、熱膨張率を向上することができる。
また、成層リーン燃焼は点火プラグ近傍のみに燃料を集めるため、スワール流と呼ばれる空気の流れを利用する方式が広く利用されている。これは、空気が渦（スワール）の中心に向かって流れるという性質を利用したもので、点火プラグを渦の中心に配置し渦にのせて燃料を流せば、点火プラグ付近に燃料を集めることができ、従って成層リーン燃焼が可能となる。 In recent years, problems of environmental conservation and fuel depletion have been raised, and the automobile industry is urgently required to respond to these problems. As an example of this countermeasure, there is an ultra lean combustion of the engine using a stratified mixture, so-called stratified lean combustion. Stratified lean combustion is a technique in which a combustible air / fuel mixture is formed only in a part of the combustion chamber and in the vicinity of the spark plug and burns it. This reduces intake loss and increases the coefficient of thermal expansion. be able to.
In addition, since stratified lean combustion collects fuel only in the vicinity of the spark plug, a method using an air flow called a swirl flow is widely used. This uses the property that air flows toward the center of the vortex (swirl), and if the spark plug is placed in the center of the vortex and fuel flows through the vortex, the fuel can be collected near the spark plug. Stratified lean combustion is therefore possible.

従って、成層リーン燃焼においては、可燃混合気の分布にバラツキが生じる場合があり、従って着火機会の観点で長期間の火花放電が要求される。また、混合気の濃度にもバラツキがあり、点火プラグへのカーボン固着による燻りリークが発生し易くなる状況がある。この観点から成層リーン燃焼においては、エネルギーのリーク経路が生成されている状況下においても確実に火花放電を発生できるよう、高い２次電流が要求される。   Therefore, in stratified lean combustion, the distribution of the combustible air-fuel mixture may vary, and therefore, long-term spark discharge is required from the viewpoint of ignition opportunities. In addition, there is a variation in the concentration of the air-fuel mixture, and there is a situation in which stagnation leak due to carbon sticking to the spark plug tends to occur. From this viewpoint, in stratified lean combustion, a high secondary current is required so that spark discharge can be reliably generated even in a situation where an energy leak path is generated.

これに対し、特許文献１に記載の点火装置が提案されている。特許文献１に記載の点火装置は、点火プラグの電極間で絶縁破壊を起こすために容量放電式の点火方法を用い、この後の誘導放電を維持するために予めエネルギーを蓄積したコイルから点火コイルの１次側へエネルギーを断続的に供給することで点火プラグの電極間に交流の火花放電を連続して発生させるものであり、高い初期２次電流と長期間の火花放電の両立を実現している。   On the other hand, an ignition device described in Patent Document 1 has been proposed. The ignition device described in Patent Document 1 uses a capacitive discharge type ignition method to cause dielectric breakdown between the electrodes of the ignition plug, and from the coil in which energy is stored in advance to maintain the subsequent induction discharge. By intermittently supplying energy to the primary side of this, alternating spark discharge is continuously generated between the electrodes of the spark plug, realizing both high initial secondary current and long-term spark discharge. ing.

特許第４４９７０２７号Japanese Patent No. 4497027

一方で、点火プラグ付近には可燃混合気の激しい渦流、流動が発生しており、燃料を着火するための火花放電の開始、継続を困難にしている。火花放電は、電極間に高電圧を印加することで電極間の分子をα作用等によりプラズマ化、このプラズマを伝って電流が流れる現象であるが、上記のような激しい流動によりプラズマ化した分子そのものが流されたり、もしくは冷やされてプラズマが消失してしまう現象（吹飛び現象）があり、火花放電を開始し難い状態となり、放電を開始できたとしても、電流を流すための道（プラズマ）が消えてしまえば、火花放電はそこで途切れてしまう。   On the other hand, intense vortex and flow of the combustible air-fuel mixture are generated in the vicinity of the spark plug, making it difficult to start and continue the spark discharge for igniting the fuel. Spark discharge is a phenomenon in which molecules between electrodes are turned into plasma by α action, etc. by applying a high voltage between the electrodes, and current flows through this plasma. There is a phenomenon (blown phenomenon) in which the plasma itself disappears when it is flowed or cooled, and it becomes difficult to start spark discharge, and even if the discharge can be started, the path for flowing current (plasma) ) Disappears, the spark discharge is interrupted there.

上記特許文献１に記載の点火装置においては、低放電電流での動作時は前記吹飛び現象が発生し易いという問題があった。すなわち、火花放電の放電電流そのものも、道であるプラズマ生成に寄与しており、放電電流が大きければ、道が飛ばされても電流自身で道を補修することができるので道が途切れ難く、前記吹飛び現象が発生し難いといえるが、逆に放電電流が小さければ、電流自身の作るプラズマが少なく、道の補修が間に合わない場合が発生し、従って道が途切れ易く、前記吹飛び現象が発生し易いといえる。
そして放電が一度途切れてしまうと、点火プラグの電極間で再度絶縁破壊を起こすことはできず、そこで火花放電は途切れ、終了となってしまう。 The ignition device described in Patent Document 1 has a problem in that the blow-off phenomenon is likely to occur during operation at a low discharge current. That is, the discharge current itself of the spark discharge also contributes to plasma generation as a road, and if the discharge current is large, the road can be repaired by the current itself even if the road is skipped, and the road is difficult to break. It can be said that the blow-off phenomenon is difficult to occur, but conversely, if the discharge current is small, there is little plasma generated by the current itself, and the road repair may not be in time, so the road is easily interrupted and the blow-off phenomenon occurs. It is easy to do.
Once the discharge is interrupted, dielectric breakdown cannot occur again between the electrodes of the spark plug, and the spark discharge is interrupted and terminated.

また点火プラグの電極間に燻りリーク経路がある状況下では、容量放電式により初回の絶縁破壊は可能であるが、この後の火花放電電流が小さければ、リーク経路から逃げるエネルギーの割合が大きく、前記同様、火花放電を維持できなくなってしまう場合があり、着火機会を逸失してしまうこととなる。
また、特許文献１に記載の点火装置では、通常運転時と成層リーン燃焼時とそれぞれ別のＤＣ／ＤＣコンバータを備えた、より大きな放電電流を発生させる仕組みを提案しているが、このためにはより大きなＤＣ／ＤＣコンバータと、より大きなエネルギー蓄積コイルが必要となり、発熱と製品の大きさに課題が残る。 Also, under the situation where there is a leakage path between the electrodes of the spark plug, the first dielectric breakdown is possible by the capacitive discharge method, but if the spark discharge current after this is small, the proportion of energy escaping from the leakage path is large, As described above, spark discharge may not be maintained, and the opportunity for ignition is lost.
In addition, the ignition device described in Patent Document 1 proposes a mechanism for generating a larger discharge current that includes separate DC / DC converters for normal operation and stratified lean combustion, respectively. Requires a larger DC / DC converter and a larger energy storage coil, leaving problems in heat generation and product size.

この発明は、上記のような問題点を解決することを目的とするものであって、高い２次電流と長期間の火花放電を実現し、火花放電が途切れても再度絶縁破壊を発生させ、火花放電を再開できる、コンパクトな容量放電式の点火装置を提供するものである。   The present invention is intended to solve the above-described problems, and realizes a high secondary current and a long-term spark discharge, and generates a dielectric breakdown again even when the spark discharge is interrupted. A compact capacitive discharge type ignition device capable of resuming spark discharge is provided.

この発明における点火装置は、点火プラグに高電圧を供給する点火コイルと、前記点火コイルにエネルギーを供給するエネルギー供給装置と、前記点火コイルと前記エネルギー供給装置との間に配置された第1のスイッチと、前記第1のスイッチの導通を制御する制御装置とを備えた点火装置であって、前記エネルギー供給装置は、直流電源と、前記直流電源につながる共振コイルと、前記共振コイルにつながる点火コンデンサと、前記点火コンデンサとアースとの間に配置される第２のスイッチとを備え、前記エネルギー供給装置は、前記制御回路からの第１の指令によって前記第２のスイッチがＯＮ、前記第１のスイッチがＯＦＦされることにより、前記共振コイルと前記点火コンデンサとでＬＣ共振を発生させ、前記直流電源の出力電圧値よりも絶対値が大きな電圧値となるよう前記点火コンデンサを充電し、前記制御回路からの第２の指令によって前記第２のスイッチがＯＦＦ、前記第１のスイッチがＯＮされることにより、前記点火コンデンサのエネルギーを前記点火コイルに供給するようにすることを特徴とするものである。   The ignition device according to the present invention includes an ignition coil that supplies a high voltage to an ignition plug, an energy supply device that supplies energy to the ignition coil, and a first that is disposed between the ignition coil and the energy supply device. An ignition device comprising a switch and a control device for controlling conduction of the first switch, wherein the energy supply device includes a DC power source, a resonance coil connected to the DC power source, and an ignition connected to the resonance coil A capacitor, and a second switch disposed between the ignition capacitor and ground, and the energy supply device is configured such that the second switch is turned on by a first command from the control circuit, and the first switch When the switch is turned off, LC resonance occurs between the resonance coil and the ignition capacitor, and the output voltage of the DC power supply The ignition capacitor is charged so that the absolute value becomes a voltage value larger than that, and the second switch is turned off and the first switch is turned on by a second command from the control circuit. The energy of the capacitor is supplied to the ignition coil.

この発明の点火装置によれば、高い２次電流と長期間の火花放電を実現でき、火花放電が途切れても再度絶縁破壊を発生させ、火花放電を再開でき、かつ装置を小型化できるようになる。   According to the ignition device of the present invention, a high secondary current and a long-term spark discharge can be realized, and even if the spark discharge is interrupted, a dielectric breakdown is generated again, the spark discharge can be resumed, and the device can be downsized. Become.

この発明の実施の形態１における点火装置の概略構成を示す図である。It is a figure which shows schematic structure of the ignition device in Embodiment 1 of this invention. この発明の実施の形態１における点火装置の回路構成図である。It is a circuit block diagram of the ignition device in Embodiment 1 of this invention. 図２の点火装置における各部の波形を示すタイミングチャートである。It is a timing chart which shows the waveform of each part in the ignition device of FIG. 図２の点火装置における各部の波形を示す他のタイミングチャートである。FIG. 6 is another timing chart showing waveforms of respective parts in the ignition device of FIG. 2. FIG.

実施の形態１．
本発明になる点火装置の概略構成を図１に示しており、図１において、点火プラグ１０１に火花放電を発生させるための高電圧を供給する点火コイル１０２に対し、エネルギー供給装置１０４からエネルギーを供給する。前記点火コイル１０２とエネルギー供給装置１０４との間には第１のスイッチ１０５が配置され、制御装置１０３により所定のスイッチング制御がなされる。前記エネルギー供給装置１０４は、バッテリ等からなる直流電源１１０と、この直流電源１１０につながる共振コイル１１１と、この共振コイルにつながる点火コンデンサ１１２と、前記点火コンデンサ１１２とアース１０９との間に配置される第２のスイッチ１１３とから構成されている。 Embodiment 1 FIG.
FIG. 1 shows a schematic configuration of an ignition device according to the present invention. In FIG. 1, energy is supplied from an energy supply device 104 to an ignition coil 102 that supplies a high voltage for generating a spark discharge in a spark plug 101. Supply. A first switch 105 is disposed between the ignition coil 102 and the energy supply device 104, and predetermined switching control is performed by the control device 103. The energy supply device 104 is disposed between a DC power source 110 formed of a battery or the like, a resonance coil 111 connected to the DC power source 110, an ignition capacitor 112 connected to the resonance coil, and the ignition capacitor 112 and the ground 109. And a second switch 113.

前記エネルギー供給装置１０４は制御装置１０３からの制御信号に基づいてエネルギーを蓄積する。蓄積されたエネルギーは、制御装置１０３の指示に基づき第１のスイッチ１０５を介して点火コイル１０２へと供給される。点火コイル１０２はこのエネルギーの供給に応じて高電圧を発生し、この高電圧を点火プラグ１０１の電極間に印加する。これにより点火プラグ１０１の電極間で絶縁破壊、火花放電が発生される。   The energy supply device 104 stores energy based on a control signal from the control device 103. The accumulated energy is supplied to the ignition coil 102 via the first switch 105 based on an instruction from the control device 103. The ignition coil 102 generates a high voltage in response to this energy supply and applies this high voltage between the electrodes of the spark plug 101. Thereby, dielectric breakdown and spark discharge are generated between the electrodes of the spark plug 101.

図２はこの発明の実施の形態１における点火装置の具体的回路構成図を示しており、図中、図１と同一および相当部分には同一符号を付している。図２において、直流電源１１０は周知のＤＣ／ＤＣコンバータ２０３で構成されており、付加的に後で説明するモニター回路２０４および電圧調整回路２０５が付属されている。上記第１のスイッチ１０５および第２のスイッチ１１３はＩＧＢＴで構成された例を示しているが、これに限らずパワートランジスタ、ＭＯＳＦＥＴ等で代置することができる。ハーフブリッジ駆動回路２０２は上記第１のスイッチ１０５および第２のスイッチ１１３を駆動するためのものであり、特にフローティング状態にある上記第１のスイッチ１０５のエミッタ（ソース）の電位を安定化するために用いられるものであって、市販のもので良い。   FIG. 2 shows a specific circuit configuration diagram of the ignition device according to Embodiment 1 of the present invention. In FIG. In FIG. 2, the DC power supply 110 is constituted by a well-known DC / DC converter 203, and additionally a monitor circuit 204 and a voltage adjustment circuit 205 described later are attached. Although the first switch 105 and the second switch 113 are configured with IGBTs, the present invention is not limited to this and can be replaced with a power transistor, a MOSFET, or the like. The half-bridge driving circuit 202 is for driving the first switch 105 and the second switch 113, and in particular for stabilizing the potential of the emitter (source) of the first switch 105 in a floating state. A commercially available product may be used.

直流電源１１０のＤＣ／ＤＣコンバータ２０３はバッテリ１００の電圧を昇圧し、短時間であれば十分な直流電流を供給することができる。直流電源１１０とアース１０９との間に、共振コイル１１１、点火コンデンサ１１２および第２のスイッチ１１３が直列に配置される。また点火コンデンサ１１２と点火コイル１０２との間には第１のスイッチ１０５が設置され、これら第１のスイッチ１０５および第２のスイッチ１１３は制御装置１０３によりＯＮ／ＯＦＦが制御される。   The DC / DC converter 203 of the DC power supply 110 boosts the voltage of the battery 100 and can supply a sufficient DC current for a short time. Between the DC power supply 110 and the ground 109, a resonance coil 111, an ignition capacitor 112, and a second switch 113 are arranged in series. A first switch 105 is installed between the ignition capacitor 112 and the ignition coil 102, and the first switch 105 and the second switch 113 are ON / OFF controlled by the control device 103.

続いて図２の回路動作をエネルギー供給装置１０４の内部動作を含めて説明する。第１のスイッチ１０５がＯＦＦ、つまり点火コンデンサ１１２と点火コイル１０２との間が非導通の状態で第２のスイッチ１１３をＯＮ、つまり点火コンデンサ１１２とアース１０９との間を導通状態にすると、直流電源１１０からアース１０９に向かって電流が流れ始める。このとき共振コイル１１１と点火コンデンサ１１２との間でＬＣ共振が発生し、直流電源１１０の電圧よりも高いところまで電圧が引き上げられる。この引き上げられた電圧により点火コンデンサ１１２は非常に高速に、かつ直流電源１１０の電圧より高い電圧まで充電される。   Next, the circuit operation of FIG. 2 will be described including the internal operation of the energy supply device 104. When the first switch 105 is OFF, that is, when the second switch 113 is turned ON while the ignition capacitor 112 and the ignition coil 102 are non-conductive, that is, when the ignition capacitor 112 and the ground 109 are conductive, the DC Current begins to flow from the power source 110 toward the ground 109. At this time, LC resonance occurs between the resonance coil 111 and the ignition capacitor 112, and the voltage is raised to a place higher than the voltage of the DC power supply 110. With this increased voltage, the ignition capacitor 112 is charged at a very high speed to a voltage higher than the voltage of the DC power supply 110.

点火コンデンサ１１２の充電が完了した後、第２のスイッチ１１３をＯＦＦ、第１のスイッチ１０５をＯＮにすると、点火コンデンサ１１２に蓄積された電荷が点火コイル１０２へと流れ込み、それに応じて点火コイル１０２は高電圧を発生する。この高電圧により点火プラグ１０１の両電極間に火花放電が発生し、内燃機関の点火動作が実行されるものである。   After the charging of the ignition capacitor 112 is completed, when the second switch 113 is turned off and the first switch 105 is turned on, the electric charge accumulated in the ignition capacitor 112 flows into the ignition coil 102, and the ignition coil 102 is responded accordingly. Generates a high voltage. This high voltage causes a spark discharge between the electrodes of the spark plug 101, and the ignition operation of the internal combustion engine is executed.

前述したように実施の形態１の点火装置にあっては、点火コンデンサ１１２を非常に高速に充電できるので、エネルギー供給装置１０４の構成要素が１回路であっても、例えば、点火コンデンサ１１２が１回路のみであっても、点火コイル１０２の２次コイル１０２bを複数個設けることにより、複数気筒へのエネルギー供給をまかなうことができる。
つまりエネルギー供給源を共通化することができるので、装置を小型化、低コスト化することができる。 As described above, in the ignition device according to the first embodiment, the ignition capacitor 112 can be charged at a very high speed. Therefore, even if the component of the energy supply device 104 is one circuit, for example, the ignition capacitor 112 is 1 Even if only the circuit is provided, it is possible to supply energy to a plurality of cylinders by providing a plurality of secondary coils 102b of the ignition coil 102.
That is, since the energy supply source can be shared, the apparatus can be reduced in size and cost.

また、製品としてはエネルギー供給装置１０４を同一のパッケージに収めるのが良い。もしくはエネルギー供給装置１０４そして後述する第１のスイッチ１０５、第２のスイッチ１１３を駆動するためのハーフブリッジ駆動装置２０２を併せて同一のパッケージに収めても良いし、さらに制御装置１０３を加えて同一パッケージとしても良い。   As a product, the energy supply device 104 is preferably contained in the same package. Alternatively, the energy supply device 104 and the half-bridge driving device 202 for driving the first switch 105 and the second switch 113 described later may be combined in the same package, and the control device 103 may be added to the same. It is good as a package.

次に本発明の点火装置を利用した多重点火の動作について説明する。
先ず、直流電源部１１０は、バッテリ電圧をＤＣ／ＤＣコンバータ２０３により１００Ｖ以上まで昇圧し、後段に十分な電流を供給できるようにコンデンサ２０１の充電を行う。以降、このコンデンサ２０１をタンクコンデンサと称することにする。 Next, the operation of multiple ignition using the ignition device of the present invention will be described.
First, the DC power supply unit 110 boosts the battery voltage to 100 V or more by the DC / DC converter 203 and charges the capacitor 201 so that a sufficient current can be supplied to the subsequent stage. Hereinafter, the capacitor 201 is referred to as a tank capacitor.

タンクコンデンサ２０１の容量は、点火コンデンサ１１２の容量に対して十分に大きくしておく必要がある。点火コンデンサ１１２へのエネルギー供給の大半はこのタンクコンデンサ２０１が担うことになるので、多重点火のように短期間で複数回のエネルギー供給が必要になるケースを想定すると、十分な容量差を確保しておく必要がある。本例ではタンクコンデンサ２０１の容量を１０μ〜１００μＦ程度、点火コンデンサ（１１２）の容量を０．５μ〜５μＦ程度とし、１０〜２０倍程度の容量差をとるように選択している。   The capacity of the tank capacitor 201 needs to be sufficiently larger than the capacity of the ignition capacitor 112. Since the tank capacitor 201 is responsible for most of the energy supply to the ignition capacitor 112, a sufficient capacity difference is secured assuming a case where multiple times of energy supply are required in a short period such as multiple ignition. It is necessary to keep it. In this example, the capacity of the tank capacitor 201 is set to about 10 to 100 μF, the capacity of the ignition capacitor (112) is set to about 0.5 to 5 μF, and the capacity difference is selected to be about 10 to 20 times.

タンクコンデンサ２０１の両端間電位差はモニタ回路２０４で常時モニタしておき、例えば抵抗分圧点２０６の電位がツェナーダイオード（アバランシェダイオードでも良い）２０７の降伏電圧に達するとトランジスタ２０８をＯＮさせてＤＣ／ＤＣコンバータ２０３による昇圧動作を停止させるようにしておく。これにより電力の浪費を抑え、不要な発熱を抑えることができるので、更に装置の小型化、低コスト化に寄与することができる。   The potential difference between both ends of the tank capacitor 201 is constantly monitored by the monitor circuit 204. For example, when the potential at the resistance voltage dividing point 206 reaches the breakdown voltage of a Zener diode (or an avalanche diode) 207, the transistor 208 is turned on, and the DC / The step-up operation by the DC converter 203 is stopped. As a result, waste of electric power can be suppressed and unnecessary heat generation can be suppressed, which can further contribute to downsizing and cost reduction of the apparatus.

また、図２のモニタ回路２０４に電圧調整回路２０５を付加することにより、点火コイル１０２へ供給するエネルギーを運転状態に合わせて可変とし、更に装置を低消費電力化、点火プラグ１０１を長寿命化することができる。例えば制御装置１０３から電圧調整回路２０５に制御信号を送ることにより、内部のトランジスタ２０９がＯＮになると、抵抗分圧点２０６での分圧電位が低下する。ツェナーダイオード２０７の降伏電圧は変化しないので、この降伏電圧に到達するためにはタンクコンデンサ２０１の充電電圧をより高くすることが必要になり、従って、タンクコンデンサ２０１の両端間電位差を調節することができようになる。これにより点火コンデンサ１１２の充電量が調整できるので、点火コイル１０２の２次巻線１０２ｂに発生する２次電圧Ｖ２や２次電流Ｉ２の大きさを調整できる。   In addition, by adding a voltage adjustment circuit 205 to the monitor circuit 204 of FIG. 2, the energy supplied to the ignition coil 102 can be made variable according to the operating state, further reducing the power consumption of the device and extending the life of the spark plug 101. can do. For example, when the internal transistor 209 is turned on by sending a control signal from the control device 103 to the voltage adjustment circuit 205, the divided potential at the resistance voltage dividing point 206 is lowered. Since the breakdown voltage of the Zener diode 207 does not change, it is necessary to increase the charging voltage of the tank capacitor 201 in order to reach this breakdown voltage. Therefore, the potential difference between both ends of the tank capacitor 201 can be adjusted. I can do it. As a result, the charge amount of the ignition capacitor 112 can be adjusted, so that the magnitude of the secondary voltage V2 and the secondary current I2 generated in the secondary winding 102b of the ignition coil 102 can be adjusted.

上記タンクコンデンサ２０１の充電目標は、例えばメインが１００Ｖ、切替え後は１６０Ｖに設定する。何れも容量放電式点火コイルの１次側に供給する電圧としては非常に低い電圧ではあるが、後段の回路でＬＣ共振を利用し電圧を倍程度まで引き上げることができるため、直接点火コイルの１次側にエネルギーを供給する点火コンデンサの両端間電位差は約２００〜３２０Ｖとなり、一般的な容量放電式点火装置と同レベル以上の出力電圧を得ることができる。また、上記タンクコンデンサ２０１の充電目標が１００〜１６０Ｖ程度の電圧であれば汎用の電子部品を使用でき、部品の選択肢として非常に広がり、小型、安価なものを選択できるようになる。またＤＣ／ＤＣコンバータも出力の小さい、効率の良い物を選択でき、発熱も抑えることができるようになる。   The charging target of the tank capacitor 201 is set, for example, to 100V for main and 160V after switching. In either case, the voltage supplied to the primary side of the capacity discharge ignition coil is a very low voltage. However, since the voltage can be raised to about double by using LC resonance in the subsequent circuit, 1 of the direct ignition coil is used. The potential difference between both ends of the ignition capacitor that supplies energy to the next side is about 200 to 320 V, and an output voltage equal to or higher than that of a general capacity discharge ignition device can be obtained. Further, if the charging target of the tank capacitor 201 is a voltage of about 100 to 160 V, general-purpose electronic components can be used, and the options for the components can be very widened and small and inexpensive can be selected. In addition, a DC / DC converter having a small output and high efficiency can be selected, and heat generation can be suppressed.

次に、点火コンデンサ１１２の充電動作について、図３のタイミングチャートを参照しながら説明する。図中、ａ)は制御装置１０３から第２のスイッチ１１３へハーフブリッジ駆動回路２０２を介して印加される制御信号波形Ｓｃ、ｂ)は同じく制御装置１０３から第１のスイッチ１０５へハーフブリッジ駆動回路２０２を介して印加される制御信号波形Ｓｉ、ｃ）は第２のスイッチ１１３がＯＮしたときに点火コンデンサ１１２に流れる電流波形Ｉｃ、ｄ１）はタンクコンデンサ２０１の両端電位差Ｖｔ（破線）、ｄ２）は点火コンデンサ１１２両端間電位差Ｖ１(実線）、ｅ）は点火コンデンサ１１２から点火コイル１０２の一次巻線１０２ａに流れる一次電流Ｉ１、ｆ)は同じく２次巻線１０２ｂに流れる二次電流Ｉ２を表している。   Next, the charging operation of the ignition capacitor 112 will be described with reference to the timing chart of FIG. In the figure, a) is a control signal waveform Sc, b) applied from the control device 103 to the second switch 113 via the half-bridge drive circuit 202, and a half-bridge drive circuit from the control device 103 to the first switch 105. The control signal waveform Si, c) applied via 202 is the current waveform Ic, d1) flowing through the ignition capacitor 112 when the second switch 113 is turned on, and the potential difference Vt (broken line), d2) across the tank capacitor 201. Is a potential difference V1 (solid line) between both ends of the ignition capacitor 112, e) is a primary current I1 flowing from the ignition capacitor 112 to the primary winding 102a of the ignition coil 102, and f) is a secondary current I2 flowing similarly to the secondary winding 102b. ing.

図３（ａ）に示すように、信号ＳｃがＨｉｇｈ（図３のタイミングＴ１）となると第２のスイッチ１１３はＯＮ、つまり導通状態となり、タンクコンデンサ２０１から図３（ｃ）のような電流が共振コイル１１１を介して点火コンデンサ１１２へと流れる。このとき、共振コイル１１１と点火コンデンサ１１２との間で起こるＬＣ共振により、図３（ｄ１）に示すタンクコンデンサ両端間電位差Ｖｔ(破線)の倍以上の電位で点火コンデンサ１１２は充電され、満充電時の点火コンデンサ１１２の両端間電位差Ｖ１は図３（ｄ２）の実線のように２００Ｖ程度となる。この充電時間は１０μ〜２０μｓｅｃ程度と非常に短く、これにより後述する容量放電式の多重点火が可能となる。   As shown in FIG. 3A, when the signal Sc becomes High (timing T1 in FIG. 3), the second switch 113 is turned on, that is, in a conductive state, and the current as shown in FIG. It flows to the ignition capacitor 112 via the resonance coil 111. At this time, due to the LC resonance occurring between the resonance coil 111 and the ignition capacitor 112, the ignition capacitor 112 is charged with a potential more than twice the potential difference Vt (dashed line) between both ends of the tank capacitor shown in FIG. The potential difference V1 between both ends of the ignition capacitor 112 at that time is about 200 V as shown by the solid line in FIG. This charging time is as short as about 10 μ to 20 μsec, which enables capacity discharge type multiple ignition described later.

続いて、その後の点火の動作について説明する。制御装置１０３は制御信号Ｓｃ（図３（ａ））をＬｏｗに切替え（図３のタイミングＴ２）、第２のスイッチ１１３を非導通の状態にする。この後、制御信号ＳｉをＨｉｇｈに切替え、第１のスイッチ１０５を導通状態にする。このとき第１のスイッチ１０５と第２のスイッチ１１３の両方が同時期に導通状態とならないよう注意する必要がある。このため制御装置内の回路構成を、ロジック上で制御信号Ｓｃが同時期にＨｉｇｈとならないように制限しておく。両方が同時期に導通状態となるとタンクコンデンサ２０１に蓄えているエネルギーの全てが直接点火コイル１０２の１次巻線１０２ａへと流れ込んでしまい、再度点火するためにはタンクコンデンサ２０１を一から充電することが必要になるが、これには時間を要し、多重点火等、短時間内での動作ができなくなってしまうためである。   Subsequently, the subsequent ignition operation will be described. The control device 103 switches the control signal Sc (FIG. 3A) to Low (timing T2 in FIG. 3), and sets the second switch 113 in a non-conductive state. Thereafter, the control signal Si is switched to High, and the first switch 105 is turned on. At this time, care must be taken so that both the first switch 105 and the second switch 113 do not become conductive at the same time. For this reason, the circuit configuration in the control device is limited on the logic so that the control signal Sc does not become High at the same time. If both of them become conductive at the same time, all of the energy stored in the tank capacitor 201 flows directly into the primary winding 102a of the ignition coil 102, and the tank capacitor 201 is charged from the beginning to ignite again. This is because it takes time and cannot operate within a short time such as multiple ignition.

また、第１のスイッチ１０５のエミッタはアースされていないフローティングの状態なので、ハーフブリッジ駆動装置２０２を利用して第１のスイッチ１０５を駆動できるようにする必要がある。このため、ハーフブリッジ駆動装置２０２はＩＧＢＴのゲートを駆動できる程度の電位差を作れるコンデンサ（図示していない）を備えている。前述の制御信号ＳｃがＨｉｇｈのときに、前記コンデンサを利用して電位差を作り、制御信号ＳｉがＨｉｇｈになると第１のスイッチ１０５のエミッタを基準として、前記電位差を第１のスイッチ１０５のゲートに与え、第１のスイッチ１０５を安定して駆動できるようにする。   Further, since the emitter of the first switch 105 is in a floating state that is not grounded, it is necessary to be able to drive the first switch 105 using the half-bridge driving device 202. For this reason, the half-bridge drive device 202 includes a capacitor (not shown) that can generate a potential difference that can drive the gate of the IGBT. When the control signal Sc is High, the capacitor is used to create a potential difference. When the control signal Si is High, the potential difference is applied to the gate of the first switch 105 using the emitter of the first switch 105 as a reference. The first switch 105 can be driven stably.

第１のスイッチ１０５がＯＮ、つまり導通状態となると点火コンデンサ１１２から図３（ｅ）のような１次電流Ｉ１が点火コイル１０２の１次巻線１０２ａを流れる。１次巻線１０２ａに電流が流れ始めると、磁気的に結合状態にあり、かつ１次巻線１０２ａに対して巻数を多くしている２次巻線１０２ｂには誘導起電力による高電圧Ｖ２が順方向（本例では点火プラグの中心電極（２次巻線側）が負の状態になる方向を順方向と称することにする）に発生し、これにより点火プラグ１０１の電極間で絶縁破壊を起こし、図３（ｆ）のような２次電流Ｉ２が点火プラグ１０１の電極間を順方向（図３（ｆ）の例では負側、すなわち点火プラグ１０１の側方電極（ＧＮＤ側）から中心電極に向かって電流（図示Ｉ２）が流れる方向を順方向と称する）に流れる。   When the first switch 105 is turned on, that is, in a conductive state, a primary current I1 as shown in FIG. 3E flows from the ignition capacitor 112 through the primary winding 102a of the ignition coil 102. When a current starts to flow in the primary winding 102a, the secondary winding 102b that is magnetically coupled and has a larger number of turns than the primary winding 102a receives a high voltage V2 due to the induced electromotive force. This occurs in the forward direction (in this example, the direction in which the center electrode (secondary winding side) of the spark plug is in a negative state is referred to as the forward direction), thereby causing dielectric breakdown between the electrodes of the spark plug 101. As a result, the secondary current I2 as shown in FIG. 3 (f) is centered between the electrodes of the spark plug 101 in the forward direction (in the example of FIG. 3 (f), from the negative side, that is, from the side electrode (GND side) of the spark plug 101). A direction in which a current (I2 in the drawing) flows toward the electrode is referred to as a forward direction).

引き続き多重点火の動作について説明する。図３（ｅ）に示すように、１次電流Ｉ１がまだ流れている最中に制御信号ＳｉをＬｏｗ（図３のタイミングＴ３）、つまり第１のスイッチ１０５を非導通状態にすると、２次巻線１０２ｂには誘導起電力により先ほどとは逆方向の高電圧Ｖ２が発生し、図３（ｆ）のように逆方向（すなわち正側）の２次電流Ｉ２が継続して流れる。   Next, the operation of multiple ignition will be described. As shown in FIG. 3E, if the control signal Si is set to Low (timing T3 in FIG. 3) while the primary current I1 is still flowing, that is, the first switch 105 is turned off, the secondary A high voltage V2 in the reverse direction is generated in the winding 102b due to the induced electromotive force, and a secondary current I2 in the reverse direction (that is, the positive side) continuously flows as shown in FIG.

制御信号ＳｉをＬｏｗにした直後（図３のタイミングＴ３から僅かに後）、図３（ａ）に示すように制御信号ＳｃをＨｉｇｈへと切替え、第２のスイッチ１１３を導通状態にすることで点火コンデンサ１１２を再充電しておく。逆方向の火花放電が継続している間に点火コンデンサ１１２の再充電を完了し、制御信号Ｓｉ（図３（ｂ））をＨｉｇｈへと切替える（図３のタイミングＴ４）と再び順方向の誘導起電力が発生し、継続して今度は順方向に放電電流が流れ始める。   Immediately after the control signal Si is set to Low (slightly after the timing T3 in FIG. 3), the control signal Sc is switched to High as shown in FIG. 3A, and the second switch 113 is turned on. The ignition capacitor 112 is recharged. While the reverse spark discharge continues, the recharging of the ignition capacitor 112 is completed, and when the control signal Si (FIG. 3B) is switched to High (timing T4 in FIG. 3), the forward induction is performed again. An electromotive force is generated, and a discharge current starts to flow in the forward direction continuously.

このように、火花放電が継続している最中に、つぎつぎとスイッチング動作を繰り返すことで順方向、逆方向にと継続して火花放電電流を流す、いわゆる、交流の連続火花放電を起こすことができる。このような交流の連続火花放電を発生させるためには点火コイル１０２の１次巻線１０２ａと２次巻線１０２ｂの巻数比を大きく、例えば１００倍から２００倍程度とする方が良い。また点火コイルの放電時間特性も少し長めとなるように、２次巻線１０２ｂの巻数を多く、例えば５０００から１００００ターン程度としておくと良い。スイッチング動作の間隔は５０μ〜５００μｓｅｃ程度とすると良い。   Thus, while the spark discharge is continuing, the so-called continuous spark discharge of alternating current that causes the spark discharge current to flow continuously in the forward direction and the reverse direction by repeating the switching operation one after another can be caused. it can. In order to generate such AC continuous spark discharge, it is better to increase the turn ratio of the primary winding 102a and the secondary winding 102b of the ignition coil 102, for example, about 100 to 200 times. Further, the number of turns of the secondary winding 102b is preferably large, for example, about 5000 to 10,000 turns so that the discharge time characteristics of the ignition coil are slightly longer. The interval of the switching operation is preferably about 50 to 500 μsec.

実施の形態２．
次に、点火コンデンサ１１２の他の充電動作について、図４のタイミングチャートを参照しながら説明する。図中、ａ)〜ｆ)はそれぞれ図３で説明したと同じ各部波形図である。すなわち、ａ)は制御信号波形Ｓｃ、ｂ)は制御信号波形Ｓｉ、ｃ）は第２のスイッチ１１３がＯＮしたときに点火コンデンサ１１２に流れる電流波形Ｉｃ、ｄ１）はタンクコンデンサ２０１の両端電位差Ｖｔ（破線）、ｄ２）は点火コンデンサ１１２両端間電位差Ｖ１(実線）、ｅ）は点火コンデンサ１１２から点火コイル１０２の一次巻線１０２ａに流れる一次電流Ｉ１、ｆ)は同じく２次巻線１０２ｂに流れる二次電流Ｉ２を表している。 Embodiment 2. FIG.
Next, another charging operation of the ignition capacitor 112 will be described with reference to the timing chart of FIG. In the figure, a) to f) are the same waveform charts as those explained in FIG. That is, a) is a control signal waveform Sc, b) is a control signal waveform Si, c) is a current waveform Ic flowing through the ignition capacitor 112 when the second switch 113 is turned ON, and d1) is a potential difference Vt between both ends of the tank capacitor 201. (Dashed line), d2) is the potential difference V1 across the ignition capacitor 112 (solid line), e) is the primary current I1 flowing from the ignition capacitor 112 to the primary winding 102a of the ignition coil 102, and f) is also flowing through the secondary winding 102b. The secondary current I2 is represented.

図３と異なる点は、図３では１次電流Ｉ１がまだ流れている最中に制御信号ＳｉをＬｏｗ（図３のタイミングＴ３）としたが、図４においては、点火コイル１０２の１次巻線１０２ａに流れる１次電流Ｉ１（図４（ｅ））が流れ終わってから、制御信号Ｓｉ（図４（ｂ））をＬｏｗとし、続いて制御信号Ｓｃ（図４（ａ））をＨｉｇｈとして点火コンデンサ１１２を再充電し、その後、制御信号Ｓｃ（図４（ａ））をＯＦＦとした後、再び制御信号Ｓｉ（図４（ｂ））をＨｉｇｈとするような点火操作を繰返し行うようにしたものである。   The difference from FIG. 3 is that the control signal Si is set to Low (timing T3 in FIG. 3) while the primary current I1 is still flowing in FIG. 3, but in FIG. After the primary current I1 (FIG. 4 (e)) flowing through the line 102a has finished flowing, the control signal Si (FIG. 4 (b)) is set to Low, and then the control signal Sc (FIG. 4 (a)) is set to High. After the ignition capacitor 112 is recharged, and then the control signal Sc (FIG. 4A) is turned OFF, the ignition operation is repeated so that the control signal Si (FIG. 4B) is set to High again. It is a thing.

このようにすると、火花点火放電は途切れ途切れにはなってしまうが、実施の形態１と同様に長期間の着火機会を得ることができる。この実施の形態２によれば、点火装置として放電の連続性を要求されないので、モニタ装置２０４によるタンクコンデンサ２０１の充電電圧モニタ値が目標値から大きく乖離している場合、例えば充電目標１００Ｖに対して５０Ｖを下回ったと判断されるような場合には、トランジスタ２０８を導通させて多重点火を禁止したり、例えば通常は５０μｓｅｃ間隔で２０回の多重点火を実施していたものを、１００μｓｅｃ間隔で１０回、あるいは２００μｓｅｃ間隔で５回というように、多重点火の回数を減らし電荷の消費量を削減、あるいは多重点火の間隔を広くし充電期間を増加させ、着火の期間としては同等のまま次の点火を確実に実施するための充電を優先することができる。   In this way, the spark ignition discharge is interrupted, but a long-term ignition opportunity can be obtained as in the first embodiment. According to the second embodiment, since the continuity of discharge is not required as the ignition device, when the monitoring value of the charging voltage of the tank capacitor 201 by the monitoring device 204 is greatly deviated from the target value, for example, with respect to the charging target 100V If it is determined that the voltage is lower than 50 V, the transistor 208 is turned on to prohibit multiple ignition, or, for example, normally 20 times multiple ignition at 50 μsec intervals is performed at 100 μsec intervals. 10 times or 5 times at 200 μsec intervals to reduce the number of multiple ignitions and reduce the amount of charge consumption, or widen the multiple ignition intervals to increase the charging period, and the ignition period is equivalent. It is possible to give priority to charge for reliably performing the next ignition.

以上のようにこの発明は、ＬＣ共振を利用することによりＤＣ／ＤＣコンバータの昇圧電圧を低く抑えることができるので、ＤＣ／ＤＣコンバータを効率良く動作させることができるようになり、回路の消費電力を低く抑えることができる。
また、ＬＣ共振を利用するとＤＣ／ＤＣコンバータの昇圧電圧を低く抑えることができるので、耐電圧の低い部品を選択でできるようになり、小型化、低コスト化することができる。更に、非常に短時間で点火コンデンサを充電できるので、交流の連続火花放電、容量放電式での多重点火が可能となる。 As described above, according to the present invention, since the boosted voltage of the DC / DC converter can be kept low by using the LC resonance, the DC / DC converter can be operated efficiently, and the power consumption of the circuit Can be kept low.
Further, when LC resonance is used, the boosted voltage of the DC / DC converter can be kept low, so that components with a low withstand voltage can be selected, and the size and cost can be reduced. Furthermore, since the ignition capacitor can be charged in a very short time, it is possible to perform multiple continuous ignition using an alternating current spark discharge and a capacitive discharge method.

この発明による点火装置は、内燃機関を利用する自動車、二輪車、船外機、その他特殊機械などに広く搭載され燃料への着火を確実に行えるようになるので、内燃機関を効率良く運転できるようになると共に、燃料枯渇問題、環境保全に役立つものである。   The ignition device according to the present invention is widely installed in automobiles, motorcycles, outboard motors, and other special machines that use an internal combustion engine, and can reliably ignite fuel, so that the internal combustion engine can be operated efficiently. At the same time, it is useful for fuel depletion and environmental conservation.

１００ バッテリ、 １０１ 点火プラグ、 １０２ 点火コイル、
１０３ 制御装置、 １０４ エネルギー供給装置、 １０５ 第１のスイッチ、
１１０ 直流電源、 １１１ 共振コイル、 １１２ 点火コンデンサ、
１１３ 第２のスイッチ、 ２０２ ハーフブリッジ駆動回路、
２０３ ＤＣ／ＤＣコンバータ、 ２０４ モニタ回路、
２０５ 電圧調整回路。 100 battery, 101 spark plug, 102 ignition coil,
103 control device, 104 energy supply device, 105 first switch,
110 DC power supply, 111 resonant coil, 112 ignition capacitor,
113 second switch, 202 half-bridge drive circuit,
203 DC / DC converter, 204 monitor circuit,
205 Voltage adjustment circuit.

この発明における点火装置は、点火プラグに高電圧を供給する点火コイルと、前記点火コイルにエネルギーを供給するエネルギー供給装置と、前記点火コイルと前記エネルギー供給装置との間にフローティング状態で配置された第1のスイッチと、前記第1のスイッチの導通を制御する制御装置とを備えた点火装置であって、前記エネルギー供給装置は、それぞれ同一パッケージ内に配置された、直流電源と、前記直流電源につながる共振コイルと、前記共振コイルにつながる点火コンデンサと、前記点火コンデンサとアースとの間に配置される第２のスイッチと、前記第２のスイッチのスイッチング動作後に前記第１のスイッチのスイッチングを可能にするハーフブリッジ駆動回路とを備え、前記エネルギー供給装置は、前記制御回路からの第１の指令によって前記第２のスイッチがＯＮ、前記第１のスイッチがＯＦＦされることにより、前記共振コイルと前記点火コンデンサとでＬＣ共振を発生させ、前記直流電源の出力電圧値よりも絶対値が大きな電圧値となるよう前記点火コンデンサを充電し、前記制御回路からの第２の指令によって前記第２のスイッチがＯＦＦ、前記第１のスイッチがＯＮされることにより、前記点火コンデンサのエネルギーを前記点火コイルに供給するようにすると共に、前記ハーフブリッジ駆動回路はフローティング状態にある前記第１のスイッチを安定駆動するようにしたことを特徴とするものである。 An ignition device according to the present invention is arranged in a floating state between an ignition coil that supplies a high voltage to an ignition plug, an energy supply device that supplies energy to the ignition coil, and the ignition coil and the energy supply device An ignition device comprising a first switch and a control device for controlling conduction of the first switch, wherein the energy supply devices are arranged in the same package , respectively , and the DC power source A resonance coil connected to the resonance coil, an ignition capacitor connected to the resonance coil, a second switch disposed between the ignition capacitor and the ground, and switching of the first switch after the switching operation of the second switch. and a half bridge drive circuit that allows the energy supply device, from the control circuit When the second switch is turned on and the first switch is turned off by a command of 1, LC resonance is generated between the resonance coil and the ignition capacitor, and the absolute value is larger than the output voltage value of the DC power supply. Is charged with a large voltage value, and the second switch is turned off and the first switch is turned on by a second command from the control circuit, whereby the energy of the ignition capacitor is reduced. The first bridge is supplied to the ignition coil, and the half-bridge drive circuit stably drives the first switch in a floating state .

Claims (8)

点火プラグに高電圧を供給する点火コイルと、前記点火コイルにエネルギーを供給するエネルギー供給装置と、前記点火コイルと前記エネルギー供給装置との間に配置された第1のスイッチと、前記第1のスイッチの導通を制御する制御装置とを備えた点火装置であっ
て、前記エネルギー供給装置は、直流電源と、前記直流電源につながる共振コイルと、前記共振コイルにつながる点火コンデンサと、前記点火コンデンサとアースとの間に配置される第２のスイッチとを備え、前記エネルギー供給装置は、前記制御回路からの第１の指令によって前記第２のスイッチがＯＮ、前記第１のスイッチがＯＦＦされることにより、前記共振コイルと前記点火コンデンサとでＬＣ共振を発生させ、前記直流電源の出力電圧値よりも絶対値が大きな電圧値となるよう前記点火コンデンサを充電し、前記制御回路からの第２の指令によって前記第２のスイッチがＯＦＦ、前記第１のスイッチがＯＮされることにより、前記点火コンデンサのエネルギーを前記点火コイルに供給するようにしたことを特徴とする点火装置。 An ignition coil that supplies a high voltage to the spark plug, an energy supply device that supplies energy to the ignition coil, a first switch that is disposed between the ignition coil and the energy supply device, and the first switch An ignition device including a control device for controlling conduction of the switch, wherein the energy supply device includes a DC power source, a resonance coil connected to the DC power source, an ignition capacitor connected to the resonance coil, and the ignition capacitor; A second switch disposed between the control circuit and the energy supply device, wherein the second switch is turned on and the first switch is turned off in response to a first command from the control circuit. Due to this, LC resonance is generated between the resonance coil and the ignition capacitor, and a voltage value whose absolute value is larger than the output voltage value of the DC power supply The ignition capacitor is charged so that the second switch is turned OFF and the first switch is turned ON by a second command from the control circuit, so that the energy of the ignition capacitor is supplied to the ignition coil. An igniter characterized by that. 前記エネルギー供給装置は、前記第２のスイッチのスイッチング動作後に前記第１のスイッチのスイッチングを可能にするハーフブリッジ駆動回路を備えたことを特徴とする請求項１に記載の点火装置。   2. The ignition device according to claim 1, wherein the energy supply device includes a half-bridge driving circuit that enables the switching of the first switch after the switching operation of the second switch. 前記エネルギー供給装置は、複数の前記点火コイルにエネルギーを供給することを特徴とする請求項１に記載の点火装置。   The ignition device according to claim 1, wherein the energy supply device supplies energy to the plurality of ignition coils. 前記エネルギー供給装置は、同一のパッケージ内に配置されることを特徴とする請求項１乃至請求項３のいずれかに記載の点火装置。   The ignition device according to any one of claims 1 to 3, wherein the energy supply devices are arranged in the same package. 前記点火コイルの１次電流Ｉ１が流れている最中に前記第２の指令をＬｏｗとし、続いて前記第１の指令をＨｉｇｈとすることを特徴とする請求項１に記載の点火装置。   2. The ignition device according to claim 1, wherein the second command is set to Low while the primary current I <b> 1 of the ignition coil is flowing, and subsequently, the first command is set to High. 前記点火コイルの１次電流Ｉ１が流れ終わってから前記第２の指令をＬｏｗとし、続いて前記第１の指令をＨｉｇｈとすることを特徴とする請求項１に記載の点火装置。   2. The ignition device according to claim 1, wherein after the primary current I <b> 1 of the ignition coil finishes flowing, the second command is set to Low, and then the first command is set to High. 前記直流電源は、ＤＣ／ＤＣコンバータと、前記コンバータからの出力電圧により充電されるタンクコンデンサと、前記タンクコンデンサの充電電圧をモニタするモニタ回路とを備え、前記モニタ回路は、前記出力電圧が前記タンクコンデンサの充電目標電圧から大きく乖離している場合に、前記ＤＣ／ＤＣコンバータの動作を制御して、多重点火禁止、多重点火回数削減、および多重点火間隔の拡大のうちのいずれかを行うことを特徴とする請求項１に記載の点火装置。   The DC power source includes a DC / DC converter, a tank capacitor that is charged by an output voltage from the converter, and a monitor circuit that monitors a charging voltage of the tank capacitor. When there is a large deviation from the charging target voltage of the tank capacitor, the operation of the DC / DC converter is controlled, and any one of prohibiting multiple ignition, reducing the number of multiple ignitions, and increasing the multiple ignition interval The ignition device according to claim 1, wherein: 前記直流電源は、前記制御装置からの指示に応じて前記出力電圧を変更する電圧調整回路を備えたことを特徴とする請求項７に記載の点火装置。   The ignition device according to claim 7, wherein the DC power source includes a voltage adjustment circuit that changes the output voltage in accordance with an instruction from the control device.
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